package tedu.cn.sp06.fb;
/*
调用商品服务失败时，执行这里的降级代码，返回降级结果
 */

import cn.tedu.sp01.web.util.JsonResult;
import com.netflix.hystrix.HystrixInvokableInfo;
import com.netflix.ribbon.hystrix.FallbackHandler;
import org.springframework.cloud.netflix.zuul.filters.route.FallbackProvider;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpStatus;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.stereotype.Component;
import rx.Observable;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Map;
@Component
public class ItemFB implements FallbackProvider {
    /*
   针对那个后台服务调用失败，应用当前降级类
   返回值：item-servier 只针对商品服务降级
          * 所有服务都降级
          null 所有服务都降级
    */
    @Override
    public String getRoute() {
        return "item-service";
    }

    @Override
    public ClientHttpResponse fallbackResponse(String route, Throwable cause) {
        return  new ClientHttpResponse() {
            @Override
            public HttpStatus getStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR;
            }

            @Override
            public int getRawStatusCode() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.value();
            }

            @Override
            public String getStatusText() throws IOException {
                return HttpStatus.INTERNAL_SERVER_ERROR.getReasonPhrase();
            }

            @Override
            public void close() {

            }

            @Override
            public InputStream getBody() throws IOException {
                String json=
                        JsonResult.err().code(500).msg("调用后台服务出错").toString();

                return new ByteArrayInputStream
                        (json.getBytes("UTF-8"));
            }

            @Override
            public HttpHeaders getHeaders() {
                HttpHeaders h=new HttpHeaders();
                h.set("Content-Type", "application/json;charset=UTF-8");
                return h;
            }
        };
    }
    /*
    针对那个后台服务调用失败，应用当前降级类
    返回值：item-servier 只针对商品服务降级
           * 所有服务都降级
           null 所有服务都降级
     */


}
